Dear Dr. Moore:
I have a best friend, someone I have been friends with for the past ten years. About five years ago, I found out that the love of her life was cheating on her. When I told her, she got really upset with me. She did not believe me. Well I think she secretly already knew, but she did not want to admit it. She stopped talking to me for about a year. After our time apart, we became friends again, but we no longer discuss the relationships we have with our significant others. Interestingly enough, she is still with the same guy. As recent as last week, I found out through another source, that he is still up to no good. What should I do? Do I tell her, when I think she probably already knows and risk ruining our friendship? Or do I simply turn a blind eye? Any thoughts would be helpful.